Drawbar



March 22, 1932.

D. F. AINSLIE DRAWBAR Filed Jan. 14. 1931 4 Sheets-Sheet 2 A Home y Marh22, 1932. DF. AlNsLlE DRAWBAR Filed Jan. 14, 1951 4 Sheets-Sheet 3 Inven ur ,Wd'M/JMn/s/zle t March 22, 1932. D. F, AxNsLlE DRAWBAR FiledJan. 14, 1931 4 Sheets-Sheet 4 A llorne y Patented Man 22, 1932 DONALDF. AINSLIE,QOF BISHGPf CALIFORNA DRAW'BAR" Application filed .Tan-nary14'; 1931i Serial' Nol 508,1'249.L

This invention relates to new and useful improvements ink draw bars, andmore particularly to a bar particularly adapted for use in connectionwith a tractor.

The principal object of this invention is to provide a draw bar whichwill be positiveacting, and which when not in use will be compact andnot susceptible to the ready developments of defects.y

During the course of the following speciication and claims, otherimportant objects and advantages of the invention will readily becomeapparent to the reader.

In the drawings Figure 1 represents a 'fragmentary side elevational viewof a tractor with the draw bar in use therewith. Y

Fig. 2 represents a longitudinal sectional view through the draw bar. y

Fig. 3 represents a longitudinal sectional view through the dra-w bar inreleased position.

Fig. 4 represents anend elevational view looking at the tractorendlthe-reof.

Fig. 5 represents a sectional view, taken substantially on the line'5-5`of Fig.v 3.

Fig. 6 represents a sectional view'taken substantially on the line '6 6of Fig. 3.

Fig. 7 represents a fragmentary detailed 30 sectional view through theload spring acljusting means.

Fig. 8 represents an end'viewrof one of the abutting collars.

Fig. 9 represents a front eleva-tional view 35 of the draw bar barrel.

Fig..10 represents another side elevational view of the drawV barbarrel.

Fig. 11 represents a perspective View of one of the levers.

Fig. 12 represents a perspective view of the removable pin.

Referring to the drawings wherein like numerals designate like parts, itcan be seen that the draw bar includes a barrel provided with a pair ofdiametrically opposed elongated slots 6 at its intermediate portion, anda pair of diametrically opposed and somewhat shorter slots 7 inclinedtoward onev end 50 of the barrel from the aforementioned slot 6 and on aplane at right angles to the slot 6.

@ne end ofthe barrel is provided with threads 8 onto which the threaded'collar 9 is-fengageable. Rivets extend throughrthis end portion of thebarrel for securing the blocks 9-9 within the-barrel to guide the pairoflevers, each generally referred'to by nu1neral10. Y

Each oftheselevers' 10 includes an elongatedl bar 11 having a laterallydisposed head 12 atl one endr thereof. Theopposite end of the bar isbifurcatedby the slot 13 to provide the legs 14 and 15, the leg 15 beingsubstantially longer than the leg 14' and being provid'edi with' anvinwardly disposed oblique f'ootlG.

The adjacent endof the leg 14 is beveled atitsouter'corner as'at1.7. Alug 18 projects laterally on thesame side as the head 12,and'isflocatedat the point where the bifulrc'atedportion of the bar 11terminates at its inneriextent. Y

These bars 10 are toV be assembled in overlapping relation and inopposed relation, withvthe openings' 19 registering so that the samefcank belsecuredt'o the usual tailpiece 2O (see'Fig. 1) of a tractorgenerally referred to by numerall 21, by a suitable securing element`22.

A slide sleeve' 23 is located on the intermediate'p'ortion of the barrel`and is provided with a collar 24 onl its outer end, the same beingreduced atitsinnersidel to provide the annularpocket y25 for receivingthe lugs 18 on the levers 10. Aslidecollar 26 located over the portionof the barrel having the slot 7 therein,andthissleeve 26 isprovided-with the collar 27 which is Vadapted for abutment with thecollar 25', when the draw bar is without a load.

Another collar 28 is stationarily secured to the barrel 5 byYthe'bolts29--29 land interposed between the collar 28 vand the collar 27is thebuiier spring-30. The sleeve 26 is provided with slotsregisteringwith the slotsV 7 "andfjthru 'the slots extends the key 31 providedwith"openin'gs32V inthe ends thereof for receiving cotter pins "33 [inthe man-ner shown'infFig. 6 Thiskey lis'adapted for the load. In thisposition of the draw bar, the lugs 18 are engaging Within the pockets 25and the load spring 34 Which is interposed between the adjusting nuts 35on the threaded portion 8 of the valve, and the collar 24 is erztendedfully.

Fig. 3 shows the elongated bars 11 about to be released from the barrel5. In the position shown, the lugs 1S have just disengaged from thepocket 25 of the collar 24 and the spring 34 is about to urge the collar24 in the direction toward the collar 27. From this position, the bars11 pull out of the barrel, thus permitting separation of the tractor uand trailer.

ln order to permit assembly of the coupling, the bars 11 are inserted inthe barrel and are forced baclrivardly until the oblique feet 16 of thelegs 15 engage the bolts 29. This results in a contraction of the legswhich obviously separate the legs 14 so that they ride on opposite sidesof the lrey 31 and When the key is disposed in the positionsubstantially shoivn in Fig. 2, the lugs 13 Will snap into the pocket ofthe collar 24, and thus the draw bar is firmly connected together again.

The spring 34 will exert sufficient tension against the collar 24 toalways maintain the bars "within the barrel until sufiicient force isexerted to overcome the spring sufficiently to permit disengagement ofthe leg 14 from the liey 31. it this point, the lugs 18 Will readilyride out of the pockets 25 (see Fig. 3) and immediately, the bars Willdisconnect from the barrel entirely. rlfhe j amb nut can be fed on thethreaded portion of the barrel 5 to maintain the spring compressedagainst the collar 24, so that the bars can be used Without theautomatic control operation, and furthermore this nut 35 is employed tovary the tension of the spring 34 when the same is employed forautomatic control.

l While the foregoing specification sets fort-h the invention inspecific terms, it is to be understood that numerous changes in theshape, sise and materials may be resorted to Without departing from thespirit and scope of the invention as claimed hereinafter.

Havin g thus described my invention, What I claim as new is :-d

1. A draw bar comprising a barrel, a pair of rockable levers, a fixedcollaron the barrel, a slidable collar on the barrel, a springinterposed betiveen the collars, and lugs on the levers for engagementwith the slidable collar.

2. A draw bar comprising a barrel, a pair of roclrable levers, a fixedcollar on the barrel, a slidable collar on the barrel, a springinterposed between the collars, lugs on the levers for engagement Withthe slidable collar, and a buffer spring, for absorbing the shock of thecollar When the same is released suddenly.

3. A draw bar comprising a barrel, a stationary collar and a slidablecollar on the outside of the barrel, a pair of swingable leversprojecting into the said barrel, each of said levers being provided Witha lug for engagement with the said slidable collar, each of said leversbeing provided With a slot in the end thereof located within the barrel,and a pin for disposition thru the barrel and through 4the slot in thelevers when registering.

4. A draw bar comprising a barrel, a staionary collar and a slidablecollar on the outside of the barrel, a pair of svvingable leversprojecting into the said barrel, each of said levers being provided witha lug for engagement with the said slidable collar, each of said leversbeing provided with a slot in the end thereof located Within the barrel,a pin for disposition through the barrel and through the slot in thelevers when registering, a foot member on each of the last-mentionedends of the levers, and a pair of transversely disposed members Withinthe barrel between which the feet are adapted to engage when the l versare retained by the key.

5. A draw bar of the character described comprising a barrel, a pair ofstationary collars on the barrel, a. pair of slidable collars betweenthe stationary collars in opposed relation to each other, compressiblesprings between the stationary collars and the corresponding slidablecollars, one of the said slidable collars being provided With a recesstherein, said barrel being provided With slots therein registering withthe recess, and a pair of levers projecting into the said barrel, eachlever being provided with a lug for disposition through a slot in thebarrel and for engagement into the recess of the aforementioned slidablecollar.

6. A draw bar comprising a barrel, a pair of rockable levers, a slidablecollar on the barrel, said'barrel being provided with slots therein,projections on the levers extending through the slots for engagementWith the slidable collar, an adjustable collar on the barrel, and acompressible spring interposed between the slidable collar and the saidadjustable collar.

In testimony whereof I affix my signature.

DONALD F. AINSLIE.

